Fix the formatting issue by avoiding going into link mode when lambda
doesn't have parameters.

Change-Id: Idc4ccf49752c63d21776cd033b1398a0127ccfa8
Signed-off-by: Gayan Perera <gayanper@gmail.com>
Reviewed-on: https://git.eclipse.org/r/c/jdt/eclipse.jdt.ui/+/187285
Tested-by: JDT Bot <jdt-bot@eclipse.org>
Reviewed-by: Lars Vogel <Lars.Vogel@vogella.com>